Erreur ci-dessous quand j'essaie d'installer Oracle 12c Release 2 sur RHEL 7

[oracle@oracledb database]$ ./runInstaller

Starting Oracle Universal Installer...



Checking Temp space: must be greater than 500 MB.   Actual 10828 MB    Passed

Checking swap space: must be greater than 150 MB.   Actual 2559 MB    Passed

Checking monitor: must be configured to display at least 256 colors

        >>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.    Failed <<<<



Some requirement checks failed. You must fulfill these requirements before



continuing with the installation,



Continue? (y/n) [n] y